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R. PENTLAND. PERPETUAL CALENDAR. APPLICATION FILED NOV. 15, 1920.

1,377,429. Patented y 10,1921.

' '2 SHEETS-SHEET 1. E: m

I I I I 5mm N R. PENTLAND.

PERPETUAL CALENDAR.

APPLICATION FILED NOV- 15; 1920.

1,377,429. Patented May 10,1921.

2 SHEETS-:SHEET 2.

* -1ETEDYSTATES "PATENTFF1E- my Patentinonn'n'r rnn'rnnnn, or JAoKsoNvInnn, F ORIDA; f

irnnrnrnler. CALENDAR! To allaltomitflmy concern: v

Be it known that I, inm resemm, a

' citizen ofthe 'United states, residing at Jacksonville, in the county ofgDuvaland State of Florida, have invented certain new and useful Improvements in Perpetual-Calfollowing L is a specifi endars, of whichthe cation. .c a ,e

Thisinventifon relates toqperpetua-l calendars-and is designed moreparticularly as an improvement on the 1 calendar shown in No.11,3 48,0{l4," issued July 27, 1920.;

r The patented calendar embodies twomernhere one of which is rotatable with relation tion of the member,to be selectivelygpositioned in relation to annual yearfordinals upon the other member, the last-mentioned member bearing groups of month designations,'and the'first-mentioned member bearing a pluralityofmonthly calendars ad- 7 -j usted-in juxtaposition withrelation to the month designations upon rotation of this member. The saidpatented calendar is capable of manipulation so as toinstantly produce a com'pletecalendarfor any year, past,

present or future, and which yearly calendar will in all casesbe an accurate onefor the year selected, but in the use of the calendar it has been found that some confusion is 1 likely-to be caused due to the fact that the monthly calendarsmust each embrace a total of thirty-one days, and it is necessarylthat the month designations be arranged in groups in sucha 'mannerthat they do not, strictly speaking, read in chronological or-.

the -plate l and which may be grasped-for v the purpose of rotating the said disk 3. The

der. r Therefore: is onegof the principal objects of the present invention to provide a calendar similar/to the one disclosed in the said patent but so constructed that when the rotatablelmember ofthe calendar is adjusted to obtain a combination of 'centurial and annual year ordinals representing a 'selected year, a complete calendar for that particular year, accurateuin every respect,

' produced the composite year date, the user of the device-has immediately at command a complete calendarfor theselected yeara "F'gure 1 'spa view in elevatlon F ig. 2;is asiinilarjview looking at the other side thereof, portions being broken Fig.1,3 is akvertical diametric sectional (view through the calendar} A a So far as its mechanical construction is concerned, the calendar embodying the presentqinvention comprises :two face plates or sheets which may ibe ofqmetal, celluloid, i cardboard, or any other material suitable i for the purposeyandone of which plates 5 is indicated" by the numeralil andthelother by the numeral 2, and a rotatable disk mentioned materials or any other material sp'e fia'eoa of Letters Patent. wp t tdMayyio I n ncati n filed November 15, 1920. Se1ia1 No. 424,2 08.

which is indicated by the numeral 3 and which maylikewise be. of; any of the-abo-ve 3 maybe of singlelor ofjdouble' ply con-r struction and the same is, of general circular form as shown in :Fig; 2 ofthe drawings, whereas the plates 1' and. 2 are preferably rectangular and have :their margins securedv togetherin' any suitable manner.

In order to rotatably mount'thedisk 3 between the plates 1 and 2, a'pivot l may beemployed, the pivot i'n the present instance having its shank .rotatably fitted, through an opening 5-formed in the disk 2 and be ing provided ywitha substantially flat, head 6 which contacts the outer face; of'thisplate. The shank of the pivot'may be threaded into a turn button 7 secured to thatface of the disk 3 which is presented at the faceof plate 1 is provided'rwith a circular opening 9' concentric to the pivot 4:, and'upon the face of this plate surrounding and con'cen trio-t0 the opening there is printed an annular series of ordinals indicated by'i'th'e numeral 10, the series being divided into a plurality of sectors ll'by lines 12 which are radial to the pivot 4. There are seven-of the se'ctorskli, and as a'matter of conveniencethese sectors are indicated by the reference characters 11*, 11P, 11 ,-,11 11, 11, and 11 Beginningwith zero in the sector 11*, the several sectors are- -consecuti"vely numbered in a clockwiseadirection-as indi cated y the numeral 3, and byref rse e V to" F igil', itlvvill be' observedpthat,taking.

i any yeariordinal, the ordinal designating 7 the next sector 11 but in the sector 11 :Likewise the ordinal #21 will be found in the sector'll the year ordinal 22 in the sector 11 and the year ordinal 23 in the; "sector 11*, but the year ordinal 2{1 "rep-1 resenting a 'leap year Willnot be found in the succeeding year ill be foundrin the next adjacent sector; proceeding in the'dlrection' stated, with the exception that upen the occurrence of a leap year, one sector will;

be skipped. Thus for. example, the year or- V 'dinal 1 8 ;comprising the eighteenth year i' of the firstor any-other centuryiistound in the sector 11', and the year ordinal 19 is found 'in-the'sector11?' Ho ever, as the -.tiventiethyearof'anycentury' is 'a leap year, the year Ordinal-QO Will not be ioundin the sector 11 but in the sector 1 1. In prac tice, the year ordinals :representing l eap years jWillbe printed in some distingu1sh-- ing'color or 'type-sothat-they will. not be confusedWith the year ordinals represent ing ordinary years, and this method of dis- 7 tinctionis clearly shown in said Fig.1, It

'will now: be apparent that beginning vith the ordinal .00 in the sector 11, the year 7 ordinals are, consecutively arranged; in numerical'r order in clockwise J direction, succeedlngyear ordlnals belng located in next "adjacent sectors-in the direction'stated ex cept in: therinstance ofthe year'ojrdinals representing leap 7 years WhlC ll are separated from the preceding year ordinal by a skipped sector; Also it ill be evident that hilethe-year. ordinals are arranged in sec- 1 torsdefined by the radial lines 12, they may as a "matter "of fact be consideredes arranged ingroups. I

1 That face 01% the 'disk3 which as -Osawith'in ithefopening 9 in the plate 1' is divided. by radial lines 14 into sectors 15 cori r V responding inrnu mber to the sectors 11,and

printedin an annular series upontheface 0f the'disk. and'idivided into groups by the 7 "lines dividingfthasectors, are ordinals lfi representing centurial years. As a matter convenience the sectors 15 V are severally mdicated by the numerals 15 15", 15, 15",

15 ,115 and; 15 ,'these sectors being arranged, the order stated, in'an anti clockwise direction and being preferably designated bythe ordinals ranging from 1 to "7 in the direction stated; The eenturial yeark'ordinalsbeginning with" 0 in the sector 15 are arranged in numerical 1 order throughout successive sectors in'a clockwise direction, a'nd vvhile in the illustrated em bodiment of the invention the highest centurial ordinal is 20, it will be understood that the calendar -may-be givenan unlimited; range by extending theseries of these *ord inals to any desired degree. 3 In the illustrated'arrangement beginning withthe cen-v will be op te h 1184 7 turial year ordinal 0 7 in the lsector15 We" find the centurial year ordinal 1 in the sector 15,",the'; ;centurial year ordinal '2 in the sector 15 and so on in' numerical order gthrougho'ut the series :of sectors in a clockwise direction until We reach the centurial y'ear' ordinal 17 the 1 sector 15. Asthe calendar Was changed-in 1752,

the centurialyear ordinal 17 in the said sector "15is supplemented by the annual year ordinal 51 as; indicated bythe' nu -v .'meral so as torecall to the user ofe the *calendarithe' fact" that the arrangement of centurial year ordinals in successive sectors" holds good up to and through the year 1151, but if itis desired-tolfind any date :or obtain the year calendarforfthe year 'l753or any subsequent year in the'18th.

century, it" will be necessary to havereferenceto the sectorle in which appears an- 7 other centurial yearordinal"'l 77 with a supplemental annualf ordinal 53 prefer ably in "a color distinguishing it from the centurial year ordinal 17 in the sector 15. 7

this point it maybe 'statedthat in the "use ofthe' calendar any 'com'pleteiyear orfdirial-may be produced byfrotati'ng thedisk 3 'to such positionas to'registerthe particular {sector '15 containing the centurial year ordinalwith thesector 11 containing therequired annual yearordinal; fTliLlS forexam'ple if it is desired to produce-the complete calendar 7 rotated to such position that the sector 15 The centurial year ordinals comprising the series 161 are-to be employed in calculat of thepre'sentyear 1920,the disk 3'ivillbe 7 I mg all *dates bythe calendaras revised by V Great Britain September 21752," but in or- {der that the present calendar may be employed' likewisein calculating-"dates by the "calen'd'aras correctedflby Gregory XIII on October 4,1582, a second annular'series of c'renturial yearlordin'als, indicated by the numeral: 1'8'is printed upon the face of the disk 3 Within the "bounds of and concentric to the series 1 6 andlis divided into groups or Qsectorsby the: radial division lines 14;; The arrangement of the ordinals in the series lS is 'similar to that ofjt he ordinals ofthe'series 16, the former ranging from'0 to 15 with the] supplemental; ordinal 81, and

.dividuaflly brought into, position exposed i i fth en e's 'e up nirc a i o t s n a s-3. 31 1% aleeda s a e ind individually by the numerals 20 20", 20, 20 20 20 and 20 andare located respec- 'tivelyoppositethe sectors 15?, 15, 15% 15 15 15 and 15 and by a comparison-ofthe several calendars 20, etc, it will be evident that the first day of the yearly calendar 20 "falls on-;Monday, the first day ofthe yearly calendar 20 on Tuesday, the first day ofthe yearly calendar 20v on Wednesday; etc.

In the useofthe calendar should it bede-n sired to obtain for examplethe year calendar forthe year 2018,.the disk Sis urged to position" such that the sector 15 embracing the centurial year ordinal 20? will be opposite and in registration with the sector 11" in which appearsjthe annual year ordinal 18 The sector 15 is designated bytheordinal lfas'is also the sector 11"and the sum of these ordinals is 2 whiohis the number of the sector 15 which is opposite the 0 sector ll thus indicating the fact that January 1, 2018. willtall on Monday, and by referringto Fig.2 of the drawings'it will be :observedfrom 1 the year calendar 20 that this is the fact. Assuming thatit'had been desired to produce the year calendar for the year 1866, the disk 3 would'have been rotated to the same position as above described and as illustrated in Fig. '1, and as the centurial year ordinal 18 appears in the sector-number 4 upon the said disk, theannual' year ordinal 66 appears withinythe sector 55 upon the plate 1, andwhi'ch sec-' tors are inregi'stration in this positionof the disk 3', the sum of the designatingordinals of the twosectors, is 9', and subtracting from this sum which is greater than 7, the

term 0137, we obtain as a result 2 which is the designating ordinal of the sector 15* which is in registration with the O sector 11, again indicating that Januarylst, 1866,

fell on Monday. Thus, taking the year calendar 20 as-a specific example, this caL' endar represents the true yearly calendar forany year whichmay be composed *by a combination of the centurial and annual yearordinals in the position of rotation of the disk 3 where the sector number 2 of the disk is in registration with the 0 secand indicating that the first day of the calendar year 1898 fell upon Saturday or in 7 other words the seventhday of the week.

In case the composed year ordinal represents a leap year the yearly calendars 20*, etc. may still be successfully employed as each embodies, in addi i n t twelve monthl divisions representing an ordinary year,

two additional 'montlr divisions i'or the months January and February, indicated 7 by the numeral 21. and which maybe employed in the event stated. r v f It is preferable that complete calendars 22 and23 for the years 1582 and 1752 respectively be printed upon some portion of f the article asa'whole such forexa'mple as I upon the face of the plate 2 atrelatively 0"pposite sides of the opening 19in the said plate. While in the manner above exemplifiedy-the day of the week on I which the first day i of any selective year will fall, these designating or I dinals are provided primarilyas a means for preventing errorin the use ofthe device. orexample if, it is desiredto obtain a calendar for thepresent year (1920) it will be observed that the designatingprdinal of the sector 15 in which the, centu'rialyear {19 appears is 2 and that the'sectorn11 in which the annual year 20 appears is desig tating the member 3 it may bereadily determined bytheuser or" the devicethat when he has rotated the member-3' to the pro er 7 position, the sector 15 having thedesignat ing ordinal 6 (the sum of Qum an must be locate'd opposite the zerojsector ll the designating ordinals ifor the two series. oi sectors willserve toindicata It will be understood that the leap year month. calendars 21 mayhavetheir. dates printed in'red' or some other distinguishing is claimed as new is i i 1. "In a perpetual i calendanl, members one rotatablewith"relation to the other, the second-mentionedmember bearing a plurality Having thus described the inventionywhat of groupsof annual year ordinals and the first-mentio-necTmember bearing a plurality of groups of centurial year ordinalsadapted to be selectivelypositioned wlth relat on to the groups of the second-mentioned member upon rotation of the first-mentioned mem v ber, and a pluralityof yearlycalendars upon the firstmentioned member arranged to be individually brought to a position indicated upon the second mentioned member and each comprising an arrangement of year dates 7 tion of adjustment of the first-mentioned member from related groups of such ordinals uponthe said members. j 7

g j 2. In a perpetual calendar, members one rotatable with relation tothe other, theseccud-mentioned member bearing a plurality "of groups of annual year ordinals and the lcorrectffor any composition of centurial and annual year ordinals possible in such pos1-;

first-mentioned member bearing a plurality I of groups of centurial year ordinals adapted 1 to be selectively positioned with relation to the groups of the second-mentioned member 9U "nated'by the'ordinal 4. Thus beforerorelatively positioned groups upon the two upon rotation of the first-mentioned .mem-

ber, and a: plurality of yearly calendars upon the first-mentioned member arranged to be individually brought to a position to be indicated upon' the second-mentioned 'member in the rotation ofthe sfirst-rnen- ,tioned member, each of said yearly calen- V dars comprising an arrangement of year dates such that when any one of the yearly calendars is inthesaid indicated'position, it willbe correct for any possible combination" of centurial and annual year ordinals from members forming a composite year ordinal. 3. Ina perpetual calendar, members one rotatable withrelation to the other, the second-mentioned member bearing a plurality of groups of annualyear ordinalsconseciu tively numerically indicated in a clockwise direction, the first-mentioned member hear ing a plurality of groups of centurial year ordinals l'jconse'cutively numerically designated in an anti-clockwise directiona'nd 'ofyearly calendars equaling the total num- I adapted to be seleetivelybrought to position 1 relative to the groups of annual .yearvordinals in the rotation of the said first-mentioned member, and a plurality of yearly calendars upon the first-mentioned member arranged,fin the rotation of the said member, tocbe individuallybrought to a position indicated upon the second-mentioned member, each of the yearly calendars being located relatively opposite the respective group of ,centurial year ordinals upon the first-mentioned member and each constitutingia completecalendar for a year beginning on a predetermined Week day, the-total number berofdays in a week and'the arrangement of said yearly'calendars with relation to the grouped centurial yearordinals' upon the '7 first-mentioned member being such that any yearcalendar in the indicated position will constitute a correct calendar for any year' ordinal composable by a combination of any of the 'centurial and annual year ordinals-of any two groups related in the said position mana ber. V o p V 4;. In a perpetual calendar members one rotatable with relation to the. other, the secadjustment of the first-mentioned' menr ond-mentioned member bearing a plurality of groups of annual year ordinals consecutively numericallyindicated in a clockwise direction, the first-mentioned member bearing a plurality of groups of centurial year ordinals' consecutively, numerically designated in an anti-clockwise direction and adapted to beselectively brought to position relative to the groups of annual year. ordirnals in the rotation oflthe said first-men- V,

tioned member, and a plurality of yearly J calendars upon the first-mentioned member arranged, in the rotation of the said member,

to be individually brought to a position indicated upon the second-mentioned member,

each of the yearly calendars being located relatively opposite the respective group of centurlal' year ordlnals upon the first-mentloned member and each constituting acomplete calendar for a yearbeginningon a predetermined Week day, the total number of a yearly calendars equaling the total-number of days in a week and the arrangement of said" yearly calendars with relationsto the grouped centurial year or'dinalsf upon the first-mentioned member being such that any year calendar in the indicatedlposition will ,COIlStltlltG acorrect calendar for any year 7 saidyea'rly calendars embracing, in addition tothe twelve monthly calendars or the ordi-' nary year represented, other monthly calendars for employment in can indicated leap year.

- In testimony whereof I affix my signature.

ROBERT ,PENTLALTD. ll sl a the other annual year ordinal's, and eachof 

